Bicycle actuation structure and bicycle seatpost assembly

A bicycle actuation structure comprising:

• an input member configured to receive a pulling force to move in a first direction;
• a coupling member pivotally coupled to the input member about a first pivot axis;
• an output member pivotally coupled to the coupling member about a second pivot axis to move in a second direction opposite to the first direction in response to a movement of the input member in the first direction, the second pivot axis being different from the first pivot axis;
• and
• a supporting member,
• the coupling member being pivotally coupled to the supporting member about a support pivot axis provided between the first pivot axis and the second pivot axis.

A bicycle actuation structure comprising:

• an input member configured to receive a pulling force to move in a first direction;
• a coupling member pivotally coupled to the input member about a first pivot axis;
• an output member pivotally coupled to the coupling member about a second pivot axis to move in a second direction opposite to the first direction in response to a movement of the input member in the first direction, the second pivot axis being different from the first pivot axis;
• and
• an additional coupling member pivotally coupled to the input member about a third pivot axis,
• the second direction being substantially parallel to the first direction,
• the input member being movable on a reference axis in the first direction when viewed from a third direction parallel to the first pivot axis,
• the output member being movable on the reference axis in the second direction when viewed from the third direction,
• the output member is pivotally coupled to the additional coupling member about a fourth pivot axis to move in the second direction in response to the movement of the input member in the first direction, and
• the coupling member and the additional coupling member are provided symmetrically with respect to the reference axis when viewed from the third direction.

A bicycle seatpost assembly comprising:

• a first cylinder;
• a second cylinder telescopically received in the first cylinder in a telescopic direction;
• a positioning structure to change a state of the bicycle seatpost assembly between
• a locked state where the second cylinder is positioned relative to the first cylinder in the telescopic direction, and
• an adjustable state where a position of the second cylinder is adjustable relative to the first cylinder in the telescopic direction;
• and
• a bicycle actuation structure comprising:
• an input member configured to receive a pulling force to move in a first direction;
• a coupling member pivotally coupled to the input member about a first pivot axis;
• and
• an output member pivotally coupled to the coupling member about a second pivot axis to move in a second direction opposite to the first direction in response to a movement of the input member in the first direction, the second pivot axis being different from the first pivot axis, the output member being operatively coupled to the positioning structure to change the state of the bicycle seatpost assembly between the locked state and the adjustable state in response to the movement of the input member.